arm64: entry: split SDEI entry

We'd like to keep all the entry sequencing in entry-common.c, as this
will allow us to ensure this is consistent, and free from any unsound
instrumentation.

Currently __sdei_handler() performs the NMI entry/exit sequences in
sdei.c. Let's split the low-level entry sequence from the event
handling, moving the former to entry-common.c and keeping the latter in
sdei.c. The event handling function is renamed to do_sdei_event(),
matching the do_${FOO}() pattern used for other exception handlers.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210607094624.34689-18-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 3 insertions, 45 deletions

diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c
index 2c7ca449dd51..e72953992743 100644
--- a/arch/arm64/kernel/sdei.c
+++ b/arch/arm64/kernel/sdei.c
@@ -231,13 +231,13 @@ out_err:
 }
 
 /*
- * __sdei_handler() returns one of:
+ * do_sdei_event() returns one of:
  *  SDEI_EV_HANDLED -  success, return to the interrupted context.
  *  SDEI_EV_FAILED  -  failure, return this error code to firmare.
  *  virtual-address -  success, return to this address.
  */
-static __kprobes unsigned long _sdei_handler(struct pt_regs *regs,
-					     struct sdei_registered_event *arg)
+unsigned long __kprobes do_sdei_event(struct pt_regs *regs,
+				      struct sdei_registered_event *arg)
 {
 	u32 mode;
 	int i, err = 0;
@@ -292,45 +292,3 @@ static __kprobes unsigned long _sdei_handler(struct pt_regs *regs,
 
 	return vbar + 0x480;
 }
-
-static void __kprobes notrace __sdei_pstate_entry(void)
-{
-	/*
-	 * The original SDEI spec (ARM DEN 0054A) can be read ambiguously as to
-	 * whether PSTATE bits are inherited unchanged or generated from
-	 * scratch, and the TF-A implementation always clears PAN and always
-	 * clears UAO. There are no other known implementations.
-	 *
-	 * Subsequent revisions (ARM DEN 0054B) follow the usual rules for how
-	 * PSTATE is modified upon architectural exceptions, and so PAN is
-	 * either inherited or set per SCTLR_ELx.SPAN, and UAO is always
-	 * cleared.
-	 *
-	 * We must explicitly reset PAN to the expected state, including
-	 * clearing it when the host isn't using it, in case a VM had it set.
-	 */
-	if (system_uses_hw_pan())
-		set_pstate_pan(1);
-	else if (cpu_has_pan())
-		set_pstate_pan(0);
-}
-
-asmlinkage noinstr unsigned long
-__sdei_handler(struct pt_regs *regs, struct sdei_registered_event *arg)
-{
-	unsigned long ret;
-
-	/*
-	 * We didn't take an exception to get here, so the HW hasn't
-	 * set/cleared bits in PSTATE that we may rely on. Initialize PAN.
-	 */
-	__sdei_pstate_entry();
-
-	arm64_enter_nmi(regs);
-
-	ret = _sdei_handler(regs, arg);
-
-	arm64_exit_nmi(regs);
-
-	return ret;
-}